单项选择题

The football player had studied economics in the university for ______ of roughly six years.

A．a decade
B．a time
C．an age
D．a period
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单项选择题
The juvenile delinquent was released in ______ of his good behavior.
A．case
B．way
C．view
D．event
单项选择题
A dictionary of English language, ______ by Dr Samuel Johnson, was the first real attempt as a systematic and interestingly written survey of English usage.
A．constructed
B．composed
C．compiled
D．collected
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